Bugfix/confirmed handlers empty service request (#885)

* Added reject in all confirmed service handlers, except GetEventInformation, when confirmed services with zero length occur which rejects with required parameters are missing message.

* Refactored errno use in service using debug_perror. Changed debug_perror usage to debug_fprintf. 

* Updated file and function headers in basic/service modules.

* Changed NDPU priority on confirmed messages to use requested NDPU priority.

* Renamed debug_aprintf to debug_printf_stdout for clarity.

* Convert most debug_fprintf usage to debug_print to reduce text bloat in AVR build

test/bacnet/basic/bbmd/src/main.c

@@ -68,7 +68,7 @@ uint16_t bip_receive(
  * @param mtu_len - the number of bytes of data to send
  *
  * @return Upon successful completion, returns the number of bytes sent.
- *  Otherwise, -1 shall be returned and errno set to indicate the error.
+ *  Otherwise, -1 shall be returned to indicate the error.
  */
 int bip_send_mpdu(
     const BACNET_IP_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)

test/bacnet/basic/bbmd6/src/main.c

@@ -73,7 +73,7 @@ uint16_t bip6_receive(
  * @param mtu_len - the number of bytes of data to send
  *
  * @return Upon successful completion, returns the number of bytes sent.
- *  Otherwise, -1 shall be returned and errno set to indicate the error.
+ *  Otherwise, -1 shall be returned to indicate the error.
  */
 int bip6_send_mpdu(
     const BACNET_IP6_ADDRESS *dest, const uint8_t *mtu, uint16_t mtu_len)

test/unit/bacnet/bacerror/src/main.c

@@ -5,8 +5,6 @@
  */
 
 #include "bacnet/bacerror.h"
-
-#include <errno.h>
 #include <zephyr/fff.h>
 #include <zephyr/ztest.h>
 #include <zephyr/sys/util.h>